Brad Aaron Zwahlen, M.D.
Specialist · Berkeley, CA
Brad Aaron Zwahlen, M.D. is a specialist with a practice address in Berkeley, California, and NPI 1508878406, issued on Aug 12, 2006. Check the license (California A78633, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Brad Aaron Zwahlen
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A78633 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2999 Regent St, Berkeley, CA 94705
- Phone
- (510) 704-7760
- Enumerated
- Aug 12, 2006
- Record last updated
- Jan 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (510) 704-7765
- Medicaid ID
- 00A786330 CA
- Medicare enrollment
- Enrolled (PECOS I20040625001151); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 2999 Regent St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Brad Aaron Zwahlen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A78633Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average specialist in 2024
200 Medicare Part D claims for 83 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 92 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen81 claims
- Amoxicillin30 claims
- Celecoxib21 claims
- Ondansetron Hcl15 claims
- Cephalexin13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- California Sports And OrthopaedicBerkeley, CA
- Sutter Bay Medical FoundationBerkeley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brad Aaron Zwahlen among 5,749 specialist records in California
Brad Aaron Zwahlen, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1997 · median 1989 among the 1,075 with a school on file
- Record last updated2014 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Berkeley → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Faraz Berjis, M.D.Berkeley, CA 947051366553885
- Lisa Bograd, MFTBerkeley, CA 947051780807586
- Mabel Cluff, LEBerkeley, CA 947051396617791
- Terri Dunn, M.D.Berkeley, CA 947051760543300
- Jerold Kaplan, M.D.Berkeley, CA 947051457375750
- Ethan Mee, LEBerkeley, CA 947051932064755
- Elena Moser, LCSWBerkeley, CA 947051205234077
- Iris O'NealBerkeley, CA 947051275488579
Common questions
What is Brad Aaron Zwahlen, M.D.'s NPI number?
Brad Aaron Zwahlen, M.D.'s National Provider Identifier (NPI) is 1508878406, issued on Aug 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brad Aaron Zwahlen, M.D. located?
The NPPES record lists a practice address at 2999 Regent St, Berkeley, CA, 94705. Phone: (510) 704-7760. Providers update this record themselves, so call before visiting.
How can I verify Brad Aaron Zwahlen, M.D.'s license?
NPPES lists California license number A78633, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Brad Aaron Zwahlen, M.D. prescribe under Medicare Part D?
In 2024, Brad Aaron Zwahlen, M.D. had 200 Medicare Part D claims for 83 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Brad Aaron Zwahlen, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.